* {
    padding: 0;
    box-sizing: border-box;
}

.App h1 {
    padding-bottom: 20px;
    border-bottom: 1px solid #ccc;
}

.App .main {
    display: flex;
    justify-content: flex-start;
}

.nav {
    width: 120px;
    margin: 0;
    margin-right: 20px;
}

.nav li {
    width: 100%;
    height: 40px;
    line-height: 40px;
    border: 1px solid #ccc;
    border-bottom-color: transparent;
    cursor: pointer;
    overflow: hidden;
}

.nav li:first-child {
    border-bottom: transparent;
    border-radius: 5px 5px 0 0;
}

.nav li:last-child {
    border-bottom-color: #ccc;
    border-radius: 0 0 5px 5px;
}

.nav li:hover {
    background: #0000000d;
}


.nav li a {
    display: inline-block;
    width: 100%;
    height: 100%;
    padding-left: 10px;
    text-decoration: none;
    color: #000;
}

.nav li a.is-active {
    background-color: #2b76b9;
    color: #fff;
}